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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094859ed83b72892b7fa69eb5b18e3bf7cee4d0b6aadd0244f84e44f147e5164' 
  AND token = 'LQxdUwj5xJfbjC1BcOa0I3ODE3zQZJHZWOhRHc7iCWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}